/***
Copyright (c) 2009 CommonsWare, LLC

Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at
  http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package com.commonsware.cwac.wakeful;

import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.os.PowerManager;

abstract public class AWakefulIntentService extends IntentService {
abstract protected void doWakefulWork(Intent intent);

private static final String LOCK_NAME_STATIC="com.commonsware.cwac.wakeful.AWakefulIntentService";
private static volatile PowerManager.WakeLock lockStatic=null;

synchronized private static PowerManager.WakeLock getLock(Context context) {
  if (lockStatic==null) {
    PowerManager mgr=(PowerManager)context.getSystemService(Context.POWER_SERVICE);
    
    lockStatic=mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
                          LOCK_NAME_STATIC);
    lockStatic.setReferenceCounted(true);
  }
  
  return(lockStatic);
}

public static void sendWakefulWork(Context ctxt, Intent i) {
  getLock(ctxt.getApplicationContext()).acquire();
  ctxt.startService(i);
}

public static void sendWakefulWork(Context ctxt, Class<?> clsService) {
  sendWakefulWork(ctxt, new Intent(ctxt, clsService));
}

public AWakefulIntentService(String name) {
  super(name);
  setIntentRedelivery(true);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
  if ((flags & START_FLAG_REDELIVERY)!=0) { // if crash restart...
    getLock(this.getApplicationContext()).acquire();  // ...then quick grab the lock
  }

  super.onStartCommand(intent, flags, startId);
  
  return(START_REDELIVER_INTENT);
}

@Override
final protected void onHandleIntent(Intent intent) {
  try {
    doWakefulWork(intent);
  }
  finally {
    getLock(this.getApplicationContext()).release();
  }
}
}
